# What makes compounds?

Compounds are molecules with different elements bonded together with each other through chemical bonds. All of our universe is made with compounds. Elemental gases like hydrogen $\left({H}_{2}\right)$ and oxygen $\left({O}_{2}\right)$ are not considered to be compounds as they are only made of one element. However, molecules like water $\left({H}_{2} O\right)$ and sucrose $\left({C}_{12} {H}_{22} {O}_{11}\right)$ are compounds because they have two or more different elements combined with each other.